JPS58193769A - Repairing method of inside surface of installed pipe - Google Patents

Abstract

PURPOSE:To repair the inside surface of a pipe with a reduced energy consumption, by heating compressed air by the heat generated when air is compressed, when repairing the inside surface by feeding a coating material into an existing pipe such as a gas pipe, etc., using the compressed air as carrier gas. CONSTITUTION:Compressed air generated by an air compressor 1 is led into an air current generator 7 through a header 2 to obtain a swirling flow accompanying a Karman's vortex. Subsequently, a grinding material is fed into this swirling air current from a tank 17, is fed into an existing pipe A such as a gas pipe, etc., and the inside surface of the pipe is cleaned. Subsequently, a coating material such as epoxy resin, etc. whose viscosity drops by being heated by a heater 12 in a tank 10 is added into the swirling air current by a head 8, is fed to the existing pipe A, a coating layer B is formed on the inside surface, and it is repaired. In this case, heating of the swirling air current is executed with a reduced energy consumption by utilizing waste heat in an air jacket 23 provided to an air compressor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing the inner surface of existing gas pipes, water pipes, etc., when the inner surface of the pipe is coated with a resin.

Conventionally, various methods have been proposed to repair underground or indoor pipes such as gas pipes and water pipes from the inside, but one method is to coat them with thermosetting resin such as epoxy resin. There is a method in which the agent is loaded onto a carrier gas (for example, compressed air) (transferred into the target leE crotch canal, adheres to the inner If direction, and solidifies. At this time, the weight of the supporting gas in the tube is 2 kg/c*2~7 kg/ The pressure is as high as cs2, and the flow rate is 80+n/s to 100s/s.The coating agent is diffused into the carrier gas, and as it moves through the complex and diverse existing pipe system, it is applied to the inner wall of the existing pipe. Yes, because it adheres and hardens.

In this case, it is considered that the temperature of the carrier gas affects the viscosity of the coating agent dispersed in the carrier gas, and also increases the temperature of the carrier gas.

The present invention has been made based on the above-mentioned circumstances, and in order to heat the carrier gas when supplying the carrier gas into an existing pipe with a coating agent diffused in the carrier gas. By using the thickness of the pressurizing means and the thermal energy generated, Ia is designed to save energy and reduce the viscosity of the coating agent.
This paper attempts to provide a method for repairing the inner surface of a stepped pipe.

Hereinafter, the method of the present invention will be explained based on specific examples shown in the drawings. In FIG. 1, the reference numeral 1 is a 21-pressure pump, and its compressed air outlet side is communicated with the header 2. The header 2 is connected to an air heater 4 via a governor 3, and the air heater 114 is connected to a pressure reducing valve 6 from a boiler 5.
Heat is exchanged between the steam supplied through the header 2 and the compressed air from the header 2, for example to 0.3! A carrier gas with a low positive pressure of about II/C-2 is generated. The carrier gas is brought to the resin coating head 8 via the airflow generator 7 in a desired airflow form, for example a 3I flow. On the other hand, the upper air heating fan 4 flows heated air to the coating head 8 via a bypass path 9, and the bypass path 9 is coated with a thermosetting resin such as J-bore resin. The agent is supplied from resin injection means, for example link 10.

The coating agent is supplied from the tank 10 to the bypass path 9 by dropping the liquid into heated air.

An injection method is adopted. In this embodiment, pressure regulator 1
A system is adopted in which resin is injected from inside the tank 10 by the pressure of compressed air supplied from the header 2 via the header 1. Further, the coating agent is heated in the tank 10 by an electric heater 12 to lower the viscosity to an excessive level.

In the figure, reference numeral 13 is a safety valve located downstream of the governor 3, 14 is a flow meter, and 15 is a pressure g1.16 is a cap I.

Further, in this embodiment, an abrasive charger 11 is connected downstream of the airflow generator 7 via a pulp 18, and compressed air is also supplied from the header 2 to the charger 17. Open the pulp 18/, -11, l note H
The abrasive can be supplied downstream of the airflow generator 7 using compressed air.

The primary coding head 8 is the existing pipe A (target existing pipe system including branch pipes and supply pipes) that is to be repaired using a conduit.
A coating agent recovery device 20a and an abrasive agent 111 E l 2 are connected to one inlet side of the pipe, and a coating agent recovery device 20 a and an abrasive agent 111 E l 2 are connected to the other outlet side of the existing pipe through pulps 19 a and 19 b.
0b is connected via two branched conduits 21, and a vacuum pump 22 is connected downstream of 0b.

In the present invention, the compressor 1 is provided with one aspirator 23, and the covalent gas leaving the compressor 1 passes through the jacket 23 to generate the desired heat J.
channel: 1.

As the compressor 1 is driven, the coating agent is injected into the heated air flow in the bypass passage 9, and is dispersed into the air flow and becomes fine particles.

Even if the above-mentioned coating agent is a thermosetting resin, assimilation will not occur within the usable range, and since the viscosity has been lowered by preheating, it is better dispersed in the air flow, and the particles are finer. , Therefore, the next time it enters the coding head 8, when it is transported within the existing pipe A with the carrier gas, it will be in a state where it can be transported over a longer distance. During this conveyance process, the carrier gas is introduced into the existing pipe A by the action of the airflow generator 1, and the carrier gas generates a vortex flow. 1. Existing pipe A with the help of eddy current
The coating agent that has entered the pipe collides with the inner wall of the existing pipe due to the Karman vortex flow and is adhered thereto, forming a "ding NB".

On the other hand, there is a Haki 1-Mupon in the existing pipe A! 22 drive'C
Since a negative pressure suction is applied via the conduit 21, the carrier gas is guided therethrough and carries the coating agent according to the desired route 1-, enters the collector 20a, and collects the coating agent.

In this embodiment, the pressure applied to the compatible gas by the compressor 1 is a low positive pressure, and the negative 1.1-suction force is also
For example, .=0.3 kgy'cm2 or less, but it goes without saying that high positive pressure and high negative pressure may be used to transport the supported gas.

In Figure 2, the heating energy for the air heater 4 is taken from the air jacket of the engine 1, the air after cooling the engine 24 is used as the main energy, or the air is heated from the boiler 5. The case where it is used as a supplement to the heat I energy given to @4 is shown.

As described in detail above, the present invention provides a means for pressurizing the carrier gas when the coating agent is transported into the existing pipe in a state in which it is diffused in the flow of the carrier gas, and is adhered to and solidified on the inner wall surface of the existing pipe. By adding thermal energy to the carrier gas, the coating agent diffused into the carrier gas is added, so that the following effect beam can be obtained.

(1) Since the coating agent is finely granulated and transported on a carrier gas, the transport distance is longer than when it is passed through existing pipes in liquid form, and the film formed by the coating agent can be uniform and relatively thin. .

(2) By preheating the compatible gas, thermal energy is transferred to the particles of the coating agent diffused into it, reducing the viscosity of the particles of the coating agent, and the coating agent adheres to the inner wall of the existing pipe. -1=
,can.

(3) N! Since waste heat is used to heat the retained gas, the number of 9 parts per heat source can be reduced or omitted, resulting in an energy-saving effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an example embodying the method of the present invention, and FIG. 2 is a schematic block diagram of another embodiment of the main part. 1... Funpretsuri, 4... Air heating machine, 5...
Boiler, 22...Vacuum pump, 23...■ Ajaut, 24...] Njin.

Claims (1)

[Claims] A 21-ting agent is transported into an existing pipe in a state in which it is diffused in a flow of compatible gas, and adheres to the inner wall surface of the existing pipe. A method for repairing the inner surface of an existing pipe, characterized by heating the coating agent diffused into the carrier gas by adding thermal energy generated by means for pressurizing the carrier gas to the carrier gas during solidification. .